Unless the U.S postal service can be used which transport their international
Freight on domestic airlines, and given the weight I'm not 100% sure that would even be possible, UPS will be required. They have there own planes and from memory a dozen bottles of wine we attempted to send over was quoted as $200 to $300 to Aust. (FYI after finding this out we then found you can't mail alcohol in the U.S)
So as much as it sucks I don't think it's the individuals distributors choice when it comes to quoting delivery costs.
Hope that helps.